The Latest on the Syrian conflict as a fragile cease-fire enters its fourth day (all times local):

2:40 p.m.

Russia's foreign minister says convoys entering war-torn Syria from neighboring Turkey have supplied rebel groups with weapons and is calling for the closure of the border.

In Geneva on Tuesday, Sergey Lavrov told the U.N. Human Rights Council that "gangs have received arms across this border, including from humanitarian convoys." Russia, an ally of Syria's president, has had tense ties with Turkey in recent months.

Earlier, he told the conference on disarmament that information showed "terrorist groups," have the technical specifications and facilities needed to make chemical weapons, and have hired specialists with knowledge of how to create chemical weapons.

Russia and the United States last week pushed through a "cessation of hostilities" accord in Syria. Officials say it has largely eased the violence since taking effect Saturday.

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2:30 p.m.

Russia's Defense Ministry says the ongoing cease-fire in Syria has been violated 15 times in the past 24 hours.

The ministry said in a statement Tuesday that most of the violations were recorded around Damascus, Aleppo, Homs and Latakia.

The Russians blamed the shelling on the Islamic State group and the Nusra Front, al-Qaida's Syrian branch. Both extremist groups have been left out of the current cease-fire, and the ministry statement said they have been attacking government positions and residential areas from territory controlled by the Syrian opposition.

The cease-fire in Syrian began at midnight Friday and has brought a notable reduction in hostilities for the first time in the five-year war that has killed more than 250,000 people, displaced half of Syria's population and flooded Europe with refugees.

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2:15 p.m.

A series of artillery shells exploded on the main street of a Syrian village near the Turkish border, sending a group of international reporters running for cover and underscoring the limits of Syria's partial cease-fire.

The journalists were visiting the village of Kinsibba, which overlooks the Turkish border, on a trip Tuesday organized by Russia's defense and foreign ministries.

The Russian military says the shelling came from Nusra Front, a militant group that is excluded from the Russia and U.S brokered cease-fire.

The Syrian cease-fire, which is now in its fourth day, also does not cover the Islamic State group.

Reporters were walking across the village and talking to locals when the first shell struck a hillside a few hundred meters away. No casualties were reported.